Step 1: Samudragupta.
The Prayag Prashasti (Allahabad pillar inscription) was composed by Harisena during Samudragupta’s reign. Hence A → III.
Step 2: Chandragupta II (Vikramaditya).
The Mehrauli Iron Pillar inscription is attributed to Chandragupta II. Hence B → I.
Step 3: Pulakesin II.
The Aihole inscription by Ravikirti describes the achievements of Pulakesin II. Hence C → IV.
Step 4: Ashoka.
The Girnar inscription is one of Ashoka’s edicts. Hence D → II.
Step 5: Conclusion.
Thus, the correct matching is A-III, B-I, C-IV, D-II.